作者
TJK Ideriah, FN Ikpe, FN Nwanjoku
发表日期
2013/5
期刊
World Environment
卷号
3
期号
1
页码范围
18-28
简介
Soil samples at depths of 0-15cm and 15-30cm were collected with an auger around an abandoned crude oil well with a history of spillage and from control sites at Abara and Ozuzu during the rainy and dry seasons. The speciation (exchangeable, carbonate, Fe-Mn oxide, organic and residual fractions) of the metals was determined using sequential extraction methods. The exchangeable fraction had the highest concentrations and the residual fraction had the lowest concentrations. In the dry season 22.27% Pb, 25.41% Cu, 37.78% Cd, 22.24% Cr, 24.84% Ni, 21.43% Mn and 22.43% Zn were bound to the exchangeable fraction. The heavy metals in the area were potentially bioavailable since the soils are acidic (pH 4.70–6.70), have low silt and clay contents and higher metal concentrations were associated with the non residual fractions. The soils in the area are contaminated but do not pose serious adverse effect to humans and the environment for now as the concentrations of the heavy metals were generally within or below permissible limits recommended by the Rivers State Ministry of Environment. Regular monitoring of heavy metals concentrations in the area was recommended. The re-distribution of heavy metals and other contaminants reduced their concentrations at the spilled site.
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